Smelting-furnace.



N0- 834,747. PATENTED OCT. 30, 1906. F. L. MOGAHAN. SMELTING FURNACE.

APPLIOATIOH FILED JUNE 28. 1905.

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PATENTED OCT. 30, 1906.

F. L. M GAHAN. SMELTING FURNACE.

APPLICATION FILED JUNE 28.1905.

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No. 834,747. PATENTED OCT. 30, 1906. P. L. MoGAHAN. SMELTING FURNACE.

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PATENTED 001'. so, 1906. F. L. MQGAHAN; SMELTING FURNACE.

APPLICATION FILED JUNE 28. 1905.

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l/Vl/E/VTOR Fred L. McGahan.

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'PATENTED OCT. 30, 1906.

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' combustion-chamber being provided with a;

GAHAN, a citizen of the United States, residit appertains to make and use the same, refbeing passed through a carbureter to enrich 'of smelting-chambers, pre

' from each smelting-c amber is also an in-;

FREDERICK L. MOGAHAN,

SMELTING- No. eas /4.7.

Specification of Letters Patent.

Patented Qct. 30, 1906.

Application filed June 28, 1905. Serial No. 267.399.

1'0 al w/wm it may concern: Be it known that I, FREDERICK L. Mo-

ing at the city of St. Louis, State of Missouri, have invented a certain new and useful Smeltin -Furnace, of which the *following is such-a ull, clear, and exact description as will enable any one skilled in the art to which erence being had to theaccompanying drawings, forming part of this specification.-

The object of my invention is to provide a smelting-furnace in which the heated products of combustion and unconsumed gases, are withdrawn from the furnace and after them are again returned to the furnace, so

that not only is the heat utilized, but also any unconsumed gases are consumed in their second passage through the furnace. Another object of my invention is to draw the said heated products of-combustion and gases over fresh ore, so that the said ore-isi roasted preliminary to being smelted in the smelting-furnace proper. The construction of my smelting-furnace, briefly stated, is as follows: I provide a pair 'r'ably 'cylin drical and uprightin form; Each of these smeltin -chambers is provided' with a*plurality o f combustion-chambers opening laterally into the said smelting-chambers, each,

fuel-injector for injecting fuel in order to heat{ the main or smelt chambers. Leading,

clined inclosure divided by a grating into a: roasting-chamber and a circulating-chamb'en The two inclined inclosures are connected at their upper ends, and at this point is attached. a pipe through which the heated productsof combustion and gases are drawn off over. the ore in the roasting-chamber by means of, a suction-fan. The-said gases'and products? of combustion are thendelivered to a carbu-1 reter, in which they are enriched by the addition of any suitable fuel, either liquid orf pulverized, after which the said gases and products -of combustion are againreturned: to the smelter proper by means of a second: suction-fan; After being returned to the furnace proper the gases are first passed through superheating-pipes arranged adja' cent to the smelting-chamber and are then delivered to the various combustion-chambers hereinbefore referred to. i

In the accompanyin drawings, which illustrate one form of sme ting-furnace made in accordance with my invention, Figure 1 is a top plan view of a complete smelting plant.

Fig. 2 is a side elevation ofthe same. Fig.

3 is a central section, on an enlarged scale,

through the smelter proper. Fig. 4 is an enlarged section on the section 4 4 of Fig; 6. Fig. 5 is a sectional view showing a detail of construction. Fig. 6 is atop plan -view,

partly in section, ofthe parts shown in Fig.

3; and Figs. 7 and 8 are vertical central sections throu h the carbureter, Fig. 8 .being shown on a line at right angles to the section of Fig. 7.

Like marks of reference. refer tosimilar parts in the several views of the drawings.

10 represents the two smelting-chambers, which are preferably cylindrical and upright form. Opening laterally off these smelting-chambers 10 .are the combustion-chambers 11,-which are' preferably arranged at an angle of about forty-five degrees with the said main or smelting chambers 10. Each ofthe combustion-chambers 11 is provided with-a fuel-injector 12, which is provided :1

with a supply of fuel and steam by pi e-connections, which will be fully hereina ter described.

13 represents inclined inclosures, preferably arranged at an angle of about forty-five degrees. Each of these inclosures is divided by means of'agrating of water-tubes 14 into an upper or roasting chamber 15and a lower or circulating chamber 16; The ends of the pipes-=14 are secured in boxes 17, which in -'turn are connected, by means of pipes 18 and r p with water-drums 20,--arranged at each side-of and slightly above the said inclined 'inclosures 13.-- The roasting-chambers 15 are separated from the smelting chambers 10 by me'ans Of sliding doors 21, each of which doors 21 isprovided with a grating formed of water-tubes 22. The'ends of these tubes 22 are connected tothe tubes 18-by means of jointed tubes 23, so as to allow the doors 21 to be raised and lowered. The doors- 21 arei preferably raised and lowered by means of neumatic or steam hoists 25,-as shown in ig. 3. The upper end of each of-the roasting-chambers 15 is provided with a swinging door 26, so that the up er end: of the said chamber can be openedor the insertion of-a charge of ore. Su'cli a charge of ore is preferably insertedby} mass of ahopper'-27, which is provided with aslide 28, and a telescoping 1* portion-29, which is adapted to be lowered into the position shown in Fig. 3, so that when the slide 28 is drawn the contents of the hopper 27 will be discharged into the roasting-chamber 15. Leading from the point of junction of the two circulating-chambers. 16 is a pipe 32, through which the heated products of combustion and unconsumed gasesare drawn oil by means of a fan 33. These gases and products of combustion are then discharged into a carbureter 34, which is shown in detail in Figs. 7 and 8. The pipe 32, leading from the fan 33 has an enlarged end 35, which passes down throu h the carbureter 34 and is preferably slight y belled at the end, as shown at 36 Figs. 7 and 8. Opening into the enlarged portion 35 is a second pipe 37, which leads from the smokestack of the boiler 38. A fan 39 is provided for drawing off the products of combustion and heated gases from the boiler 38 throuh the pipe 37 and dischar ing them into t e lower enlarged end 35 o the pipe 32. Arranged below the fiared or belled end 36 of the enlarged pipe 35 is a crucible 40-. Arranged just above this crucible-40- is a perforated partition 41 and above said partition 41 a second nnperfor'ate partition 42'. Passing through these two partitions 41 and 42 are a plurality of pipes 43, referably made of two different lengths, as '0 early shown in the drawings. These pipes are arranged annularly in close proximity to the outer shell of the carbureter 34, and their object is to allow the passage of oil or oil and water through the space separated by the partitions 41 and 42. Between the artitions 41 and 42 and closely surrounding t e pipe 35 is the gas-generating chamber 45. Leading from this gas-generating chamber 45 are a pair of pipes 46, which are connected to a suction-fan 47. Leading from the fan 47 are a pair of pipes 48, which return the gases andheated products of combustion to the smelter proper, as will be hereinafter more fully described. Leading from the carbureter 34 below the crucible 40 are a pair of pipes 50, which are in turn connected to separating-tanks 51. Below each of the separating-tanks 51 is arranged a dead-oil tank 52, with which it is connected by means of pipes 53'. Leading from the two dead-oil tanks 52 is a pipe 54,which is connected, by means of a pipe 55, with a pump 56. Leading from the pump 56. is a pi e 57, through which the dead oil from the tanks 52 is pumped into a reservoir 58.

59 is a return-pipe from the reservoir 58, through which the dead oil is returned to the carbureter 34. In order to prevent the carbureter from falling to too low a tem erature, I prefer to provide it with a pair o= burners 60. These burners 60 are each provided with an oil-pipe61, by means of which-the-oil is supplied to the burner. These pipes 61 are con- 6 5 nected to a pipe 62, which leads from a pipe 63, communicating with the fuel-oil tank 64. The pipe 62 is also connected with the burner 65 of the boiler 38. In order to heat the fueloil in the tank 64, I provide a steam-coil 66 in said tank. This coil 66 is supplied by steam from a pipe 67, which is connected by a pipe 68 with a pipe 69, in turn connected to the steam-drum 7'6 of the boiler 38. The pipe 67 is connected to the steam-cylinder of the.

pump 56, hereinbefore referred to, and also to the steam-cylinder of a second pump 72. The exhaust of the steam cyl inders from both the pump- 56 and the pump 72 passes through a pipe 73 to the carbureter 34. The suction end of the pump cylinder of the pump 72' is connected, by means of a pipe7'4, with a retort 75, connected with the gas gencrating chamber 45 of the carbureter 34,. and the said suction end of the said cylinder is also connected, by means of a pipe? 6, with a series of separating-chambers 77 in a passage 78, leading to a well 7 9. This passage 78 receives the discharge from a relief-pipe 80, extending from the pipe 32, and also from a relief-pipe 81, connected with the separatingtanks 51 and also with the pipe 37 through a pipe 82, also connected tothe pipes 46. 83 is the discharge-pipefrorn the pnrnp-cylinder of the pump 7 2. This pipe 83 may lead to any suitable receptacle for the various products withdrawn from the carbureter 34 and the separating-chambers 77.

The carbureter 34 also receives the exhaust from the heating-coil 66 in the fuel-oil tank 64. This exhaust passes from the coil 66 through a piple' 85, passing along within the pipe 63. Ex 'aust-steam Is also supplied to the carbureter 34 through a pipe 86, leading from the engine 87. This engine 87 is used. to drive the various exhaust-fans= by means of suitable counter-shafting and belting, which are not shown in the drawings. The engine 87 is supplied with steamby means of the i-pe 69, hereinbefore described. Leading omthe steam-dome 70 of the boiler 38 is a ipe 87, which pipe is connected with a superlieating-coil 88, arranged in the smoke box of the boiler, as clearly shown in Fig. 5 of the drawings. @onneeted with this coil 88 is a pipe 89', which is in turn connected to the pipe connections- 90, surrounding the two smelting-chambers 10. Leading fromthe pipe connections 90 to each of the fuel-in ectors 12 is a branch-pipe connection 91. 92 represents oil-pipe-connections, also-surrounding the smelting-chambers t 0. Leading from these oil-pipe connections 92 to each of' the burners 12 is a branch pipe 93. The oil-p pe connections 92 are supplied by I-neansofi a pipe 94, Fig. 2, leading from the pipe 63,-here1nbefore described. 95 represents superheatm-gpipes, which are arranged adjacent to the smelting-chambers 10. These superheatmgpipes 95 arepreferab-ly four in nurn er for each smelting-chamber, and they are arranged, as

l i x clearly shown in the drawings, Fig. 6, so as to form a continuous passage, one end of each of said passages being connected to one of the pipes 48 leading from the carbureter, as hereinbefore described. The opposite end of each of the sets of passages formed by the superheating-pipes 95 is provided with a discharge-nozzle 96, as shown in Fig. 3. This discharge -nozzle 96 preferably discharges centrally in the upper part of the smeltingchamber 10. Leading from one end of each of the superheating-pipes 95 is a branch pipe 97, which leads into one of the combustionchambers 11, so as to discharge the superheated gases into the said combustion-chamber. Leading into the opposite end of each of the said superheating-pipes 95 is a branch pipe 98, leading from the steam-pipe connections 90. The discharge-nozzle 96 is also referably provided with a supply-pipe 99, eading from the oil-pipe connections 92. Arranged in this pipe 99 is a sight-feed lubricator 100, so that the amount of oil fed through the pipe can be readily observed. In order to supply pressure on the fuel in the fuel-tank 64, I connect to said tank an airpipe 101, leading from an airpump 102. This pump 102 is also connected with an air-tank 103, so that a supply of air may be retained on hand after the plant is shut down in order to readily start the plant into operation. Leading from the pump 102 and tank 103 are two pipes 104 and 105. The pipe 104 leads to the burner of the boiler 38, hereinbefore described, and the pipe 105 leads to the pipe 89, connected to the steam-pipe connections 90, so that in starting up the plant, or, if desired, at any other time, compressed air may be used in the steam-pipe connections 90 in place of steam.

The operation of my smelting-furnace is as follows: When the plant is in full operation, each of the smelting-chambers 10 will be provided with a charge of ore, and this ore will be heated by means of the combustion-chambers 11, opening into the smelting-chamber 10. At the same time each of the roastingchambers 15 will be provided with a second charge of ore, which is placed in the chamber by means of the hopper 27, as has been hereinbefore described. The heated roducts of combustion and gases pass up t ough the water-grates 22 and into contact with the ore in the chambers 15, from whence they pass down through the water-grates 14 into the circulating-chambers 16, after which they are drawn through the pipe 32 by means of the fan 33 and discharged into the upper end of the carbureter 34. At the same time that theheated products of combustion and gases ass down through the pipe 32 into the enarged pipe 35 gases from the furnace 38 will also be discharged into the said pipe 35 through the pipe 37 by means of the fan 39. At the same time exhaust-steam and dead oil will be discharged intothe upper end of the carbureter outside of the pi e 35 through the pipes 85, 86, 59, and 73'. The oil and water from these pipes will pass down through the pipes 43 and tend to maintain the carbureter at the proper temperature. At the same time the dead oils and steam will be decomposed, forming gases, which are returned through the pipes 46 to the fan 47 and thence through the pipes 48 to-the superheating-pipes 95 surroun ing the smelting-chamber. After the gases have been thoroughly superheated in the pipes 95 they are returned through the branch pipes 97 to the combustion-chambers 11. As soon as the chargeof ore within the smelting-chamber 10 has been smelted it can be drawn off through the usual discharge-openings 107, as shown in Fig. 3. A discharge-opening 108 may be also provided for the-discharge of the slag from the smelting-chamber. After the slag and metal have been discharged from the smeltingchamber 10 the doors 22 are raised by means of the hoists 25, so that the charge of roasted ore from the roasting-chambers 15 may pass into the smelting-chambers 10.

In addition to the liquid fuel fed to the carbureter 34 I may also provide a hopper 110, as shown in Figs. 2 and 8, for receiving pulverized fuel, which may be fed into the crucible 40 by means of a screw 1 11. Arranged,

referably, below the discharge 112 from the hopper 110 is a pipe 113, leading from the crucible 40 and provided with an opening 114. Through this opening the gas within the carbureter 34 can be tested to discover when it is of sufficient richness to enable it to be drawn off through the pipes 46 and supplied to the smelting-chambers.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a smelting-furnace, the combination with an ore-smelting chamber, of a combustion chamber or chambers for heating said ore-smelting chamber, means for withdrawing the heated products of combustion and unconsumed gases from said ore-smelting chamber and returning the same to said combustion chamber or chambers,superheatingpipes surrounding said ore-smelting chamber, to which superheating-pipes said products of combustion are delivered, and communica-- tions between said superheating-pipes and said combustion chamber or chambers.

2. In a smelting-furnace, the combination with an ore-smelting chamber, of a combustion chamber or chambers for heating said ore-smelting chamber, means for withdrawing the heated products of combustion and unconsumed gases from said ore-smelting chamber and returning the same to said combustion chamber or chambers. superheating-pipes surrounding said ore-smelting chamber, to which superheating-pipes said products ofcombustion are delivered, .means for feeding steam to said superheating-pipes. and-connections between said superheatmgpipes and said-combustion chamber or chambers.

3. In a smelting-furnace, the combination with anore-smelting chamber, of a combustion chamber or chambers for heating said ore-smelting chamber, means for withdrawing the heated products ofcombustion and unconsumed gases from said ore-smeltin chamber, a carbureterreceiving said heate products of combustion and unconsumed gases, superheating-pipes adjacent to said ore-smelting chamber, means for returning said heated products of combustion and unconsumed gases from said carbureter to said superheatingpipes, and communications between-said superheating-pipes and said combustion chamber orchambers.

4. In I a smelting-furnace, thecombination with an ore-smelt ng chamber, of acombus tion chamber or chambers for heating said ore-smelting chamber, means for withdrawing the heated products of combustion and,

unconsumed gases from said ore-smeltin 1 chamber, a carbureter receivingsaid heate I products of combustion and unconsumed gases, superheating-pipes adjacent to said, ore-smelting chamber, means for returning; said heated products of combustion and unconsumed gases from said carbureter to said superheating-pipes, means for feeding steam to said superheating-pipes, and communications between said superheating pipes and said combustion chamber or chambers.

5. In asmelting furnace, the-combination with an ore-smelting chamber, of an inclosure communicating with saidore-smeltin chamber, a partition in said inclosure divi ing-the same into a roasting-chamber and-agas-fiue, and aremovable partition between said roasting-chamber and smelting-chamber.

' 6. In a smelting-furnace, the'combinat'ion with'an ore-smeltmg chamber, of an-inclined inclosure communicating with said orefismelting chamber, a partitioninsaid inclosure-dividing-the same'into aroasting-cham-ber and a gas-flue, and. aremovable partition between said roasting chamber and said smeltingchamber.

7. In a SmeItingJurnace, the combination with an ore-smelting chamber, of aninolosure communicating with said ore-smelting chamber, a grating in said inclosuredividmg-the same into a roasting-chamber and a gas-flue, and means for discharging the ore from said roasting-chamber into said smelting-chamber.

8. In a smelting-furnace, the combination with an ore-smelting chamber, of an inclined inclosure communicating with said ore-smelting chamber, a grating in said inclosure dividing the same into a roasting-chamber and a'gas-fiue, and means for dischargingthe ore ing-chamber.

9. Ina smelting-furnace, the combination with an ore-smelting chamber, of a combus-' tion-chamber for heating said ore-smelting chamber, an;inclined inclosure communicating with said ore-smelting chamber, a grating in said inclined inclosure dividing the'same into an ore-roasting chamber and a gas-flue, and-means for discharging the ore from said roasting-chamber into said smelting-chamber.

10. In a smelting-furnace, the combination with an ore-smelting chamber, of an inclosure communicating with said ore-smelting chamber, and a water-grating in said inclosure dividing the same-into aroasting-chamher and a;gas-flue.

1 1. In a smelting-furnace, the combination with an ore-smelting chamber, of an inclined inclosure communicating with said .oresmeltin chamber, and a water-grating in said inc "ned inclosure dividing. the sameinto an ore-roastin chamber and a gas-flue.

12. In asme ting-furnace, the combination withvan ore-smeltingchamber, of.an inclined inclosure communicating with said Moresmelting chamber, a grating in said inclosure dividing the samednto an oreroasting=cham- ;-ber and avgas-flue, and-a movable; grating arranged-between saidore-roasting chamber and said ore-smelting chamber.

1. 3.. In asmelting-furnace, the combination with-anoresmel ting-chamber, of an inclined inclosure commumcating with said oresmeltingchamber, awater-grating'in said in- GllIlBdlHClOSllIfi dividing the same 1nto :an oreroastingchamber-and agas-flue, and a movablewater-gratingarranged between said oreroasting chamber and said ore smelting chamber.

14. :In a smelting-furnace, the combination withanore-smelting chamber, of a roasting- =chamber communicating with said-ore-smelting chamber, a combustionchamben for heating said ore-smelting-chamber, acarbureter,

means for withdrawing the heated products of combustion and gases-from said ore-roasting chamber anddelivering the same to said carbureter, and means for returning said gases and products-ofcombustion to said combustion-chamber.

15. In a smelting-furnace, the combination with-anore-smelting chamber, of aroastingchamber communicating with said ore-smelting chamber, a combustion-chamber for heating said ore-smelting chamber, a carbureter, means for feeding fuel to said carbureter, means for withdrawing the heated products of combustion andgases from said ore-roasting chamber and delivering the same to said carbureter, and means for returning said gases and products of combustion to said combustion-chamber.

16. In. a smelting-furnace, the combination with an ore-smelting chamber, of a combustion-chamber for heating said smeltingchamber, a fuel-injector for said combustionchamber, superheating-pipes adjacent to said smeltingchamber, steam-pipe connections for said injectors, passages between said combustionchambers and said superheatingpipes, and means for Withdrawing the heated products of combustion from said smeltingchamber and returning the same through said superheating-pipes to said combustionchamber.

17, In a smelting-furnace, the combination with a smelting-chamber, of a combustionchamber for heating said smelting-chamber, a fuel-injector for said combustion-chamber, superheating-pipes arranged adjacent to said smelting-chamber, steam-pipe connections for said fuel-injectors, communications between said combustion-chamber and said superheating-pipes, and connections between said superheating-pipes and said steam-pipe connections.

18. In a smelting-furnace, the combination with an ore-smelting chamber, of superheating pipes for said chamber, combustionchambers for said smeltingchamber, passages leading from said superheating-pipes to said combustion-chambers, fuel-injectors for said combustion-chambers, steam-pipe connections for said fuel-injectors, and passages leading from said steam-pipe connections to said superheating-pi es.

19. In a smelting- 'urnace, the combination With an ore-smelting chamber, of superheating-pi es for said chamber, combustion-chambers or said smelting-chambers, a passage leading from one end of each of said superheating-pipes to said combustion-chamber, and passages leading from said steam-pipe connections to the other end of said superheatin -pipes.

20. In a smelting-furnace, the combination with an ore-smelting chamber, of a plurality of superheating-pipes arranged adjacent to said smelting chamber and connected to form a continuous passage, a combustionchamber for said smelting-chamber, fuel-inj ectors for said combustion-chambers, steampipe connections for said fuel-injectors, passages leading from one end of each of said superheatingpipes to one of said combustionchambers, and passages from said steam-pipe connections to the opposite ends of said superheating-pipes.

In testimony whereof I have hereunto set my hand and affixed my seal in the presence of the two subscribing witnesses.

I FREDERICK L. MOGAHAN. [n 8.] Witnesses:

EDGAR W. JAooBs, W. A. ALEXANDER. 

